package com.web.util;

//数据源工具类

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

public class DataSourceUtils {
    private static DataSource dataSource;

    //静态代码块，类加载时读取配置文件，并且创建数据源对象
    static {
        Properties properties = new Properties();
        try {
            properties.load(DataSourceUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            dataSource = DruidDataSourceFactory.createDataSource(properties);
        }catch (Exception e) {
            throw new RuntimeException(e);
        }
    }


    public static Connection getConnection(){
        if (dataSource != null){
            try {
                return dataSource.getConnection();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }

        return null;
    }

}
